What causes knee swelling two months after knee replacement surgery?

Knee joint replacement generally refers to knee arthroplasty. Swelling of the knee two months after knee arthroplasty may be caused by physiological factors or pathological factors, such as infection or intra-articular effusion. Appropriate management should be selected based on the underlying cause. The specific analysis is as follows:

1. Physiological Factors

If local blood vessels around the knee joint are damaged during surgery and postoperative recovery is slow, impaired blood circulation around the joint may lead to swelling. This is usually a normal phenomenon and will naturally resolve with additional rest over time.

2. Pathological Factors

1) Infection

Knee arthroplasty is an invasive procedure. If postoperative care is inadequate and the surgical site becomes infected by bacteria, viruses, or other pathogens, infection can occur. In such cases, medications such as amoxicillin capsules, cephalexin capsules, or vancomycin hydrochloride for injection may be used under medical guidance to reduce infection and alleviate knee swelling.

2) Intra-articular Effusion

If fluid remains in the joint cavity after knee replacement surgery and is not fully absorbed, increased intra-articular pressure may result. Under medical advice, physical treatments such as heat application or electrothermal therapy may be used to promote fluid absorption. Anti-inflammatory and analgesic medications such as meloxicam capsules, indomethacin capsules, or acetaminophen tablets may also be prescribed. If necessary, excess fluid may be removed via joint aspiration as recommended by a physician.

In addition, other causes such as allergic reactions, synovial hyperplasia, or lower extremity deep vein thrombosis may also contribute. It is recommended to seek timely medical evaluation for accurate diagnosis and appropriate treatment under medical supervision.